Farm Equipment - AC 5050 CAV injection pump timing

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AC 5050 CAV injection pump timing

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Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=144654
Printed Date: 24 Aug 2025 at 9:51am
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Topic: AC 5050 CAV injection pump timing

Posted By: bozrae
Subject: AC 5050 CAV injection pump timing
Date Posted: 21 Nov 2017 at 7:42am

Trying to time a CAV injection pump on a 5050.(not trying to time the gears) I have a service manual and it shows to line up the letter 'A' with the edge of the snap ring when looking through to inspection cover on the pump.

However the big snap ring appears to be installed in a rotated position so I can't line anything up. The pump has a 'sold and serviced' tag on it so it must have be repaired or replaced at one time. I don't know the history on that.

My question is, can I rotate the flywheel by hand until the injection timing mark lines up with the pointer and see when the injector sprays fuel? Or do you need more RPM to make that work.

I suspect the pump may have issues, but would like to have it timed correctly first. It does run, but seems to be putting out to much fuel.

Thanks,

Steve

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D15D, D17G, 170G, 175D, and two 5050FWA

Replies:

Posted By: injpumpEd
Date Posted: 21 Nov 2017 at 8:27am

Those pumps normally just get timed to the engine by the mark on the flange. Beyond that, you're usually just grasping at straws, and like you suspect, something else is wrong.

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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!